你可能感興趣的試題

Distilled water from an evaporator may be discharged into a potable water tank （）.

A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve

單項(xiàng)選擇題

If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.

A.worn gland sealing shaft
B.worn wearing rings
C.a bent shaft
D.reversed pump coupling

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If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

你可能感興趣的試題

Distilled water from an evaporator may be discharged into a potable water tank （）.

If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.